Ultrathin Piezoelectric Resonators Based on Graphene and Free-Standing Single-Crystal BaTiO3

Martin Lee*, Johannes R. Renshof, Kasper J. van Zeggeren, Maurits J.A. Houmes, Edouard Lesne, Makars Šiškins, Thierry C. van Thiel, Ruben H. Guis, Mark R. van Blankenstein, Gerard J. Verbiest, Andrea D. Caviglia, Herre S.J. van der Zant, Peter G. Steeneken

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)
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Abstract

Suspended piezoelectric thin films are key elements enabling high-frequency filtering in telecommunication devices. To meet the requirements of next-generation electronics, it is essential to reduce device thickness for reaching higher resonance frequencies. Here, the high-quality mechanical and electrical properties of graphene electrodes are combined with the strong piezoelectric performance of the free-standing complex oxide, BaTiO3 (BTO), to create ultrathin piezoelectric resonators. It is demonstrated that the device can be brought into mechanical resonance by piezoelectric actuation. By sweeping the DC bias voltage on the top graphene electrode, the BTO membrane is switched between the two poled ferroelectric states. Remarkably, ferroelectric hysteresis is also observed in the resonance frequency, magnitude and Q-factor of the first membrane mode. In the bulk acoustic mode, the device vibrates at 233 GHz. This work demonstrates the potential of combining van der Waals materials with complex oxides for next-generation electronics, which not only opens up opportunities for increasing filter frequencies, but also enables reconfiguration by poling, via ferroelectric memory effect.

Original languageEnglish
Article number2204630
Number of pages9
JournalAdvanced Materials
Volume34
Issue number44
DOIs
Publication statusPublished - 2022

Keywords

  • 2D materials
  • actuators
  • complex oxides
  • ferroelectrics
  • nano-electromechanical systems
  • piezoelectrics
  • resonators

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